Pressing-shaping method for manufacturing circular cooling base for being embedded with fins and mold used in the method

ABSTRACT

A pressing-shaping method for manufacturing a circular cooling base for being embedded with fins and a mold used in the method are disclosed. The method includes providing a blank ingot that has a first surface, a second surface, and a lateral circular surface encircling the rims of the first and second surfaces. The method further includes using a mold to press the blank ingot to cause the first surface of the blank ingot to indent inward to form a groove, and to cause a plurality of clipping grooves to be formed on the lateral circular surface of the blank ingot through extrusion. As a result, the blank ingot is shaped into the circular cooling base for being embedded with fins.

BACKGROUND

1. Technical Field

The present invention relates to the manufacturing process of a heatdissipator, and more particularly, to a pressing-shaping method formanufacturing a circular cooling base for being embedded with fins and amold used in the method.

2. Related Art

Conventionally, a heat dissipator is shaped through squeezing or pullinga piece of aluminum. Most of such conventional heat dissipators arecircular in shape. Generally speaking, the piece of aluminum is firstsqueezed or pulled to form a long pipe with a plurality of clippinggrooves on the pipe's outer wall. The pipe is then cut into a pluralityof heat dissipating bases, each of which is circular and has a hollowcenter. Afterward, a slab is forced into a central hollow area of eachof the heat dissipating bases, so that the slab can become aheat-receiving part of the heat dissipating base. The clipping groove onthe exterior of the heat dissipating base is then embedded with aplurality of fins to finalize a heat dissipator.

One of the primary disadvantages of this convention method is that thespaces between the clipping grooves are relatively large. As a result,there are relatively few and sparse clipping grooves. To cope with thisproblem, some manufacturers will apply additional flushing-cuttingprocess to create some additional grooves. However, this process willnot only waste raw material but also wear down the cutting tools.Furthermore, some liquid solution used to facilitate the process mayalso pollute the manufacturing factory.

BRIEF SUMMARY

The present invention provides a pressing-shaping method formanufacturing a circular cooling base for being embedded with fins and amold used in the method. Generally speaking, a mold is used to press ablank ingot, such as an aluminum blank ingot, to form the requiredcircular cooling base within a single step. This can result in a fastermanufacturing process and avoid additional cutting process. Furthermore,the present invention can save raw material and avoid environmentpollution.

The present invention provides a pressing-shaping method formanufacturing a circular cooling base for being embedded with fins. Themethod includes: a) providing a blank ingot that has a first surface, asecond surface, and a lateral circular surface encircling the rims ofthe first and second surfaces; and b) using a mold to press the blankingot to cause the first surface of the blank ingot to indent inward toform a groove, and to cause a plurality of clipping grooves to be formedon the lateral circular surface of the blank ingot through extrusion.

The present invention further provides the mold used in thepressing-shaping method. The mold includes a male mold and a femalemold. The male mold is extruded with a groove shaping part for causingthe first surface of the blank ingot to form the groove. The female moldis for working in coordination with the male mold. The female mold isindented with a mold cave space. The inner wall of the mold cave spaceis indented with a plurality of circularly arranged teeth. Thecircularly arranged teeth are for causing the lateral circular surfaceof the blank ingot to form the clipping grooves.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a flowchart according to the pressing-shaping method of thepresent invention;

FIG. 2 shows the outward appearance of the blank ingot used in thepresent invention;

FIG. 3 shows a first schematic diagram illustrating how the mold is usedto press-shape the blank ingot;

FIG. 4 shows a sectional view along the line 4-4 of FIG. 3;

FIG. 5 shows a second schematic diagram illustrating how the mold isused to press-shape the blank ingot;

FIG. 6 shows the outward appearance of the circular cooling basemanufactured according to the present invention;

FIG. 7 shows a sectional view of the circular cooling base manufacturedaccording to the present invention; and

FIG. 8 shows the outward appearance of the circular cooling base withfins further embedded thereon.

DETAILED DESCRIPTION

FIG. 1 shows an exemplary flowchart according of the present invention'spressing-shaping method for manufacturing a circular cooling base forbeing embedded with fins. The flowchart includes the following steps.

Please refer to FIG. 2, which illustrates step 51 of FIG. 1. In step 51,a blank ingot 1 is provided. The blank ingot 1 can be a solid column andbe made up of a material that has good ductility and goodheat-conductivity, such as aluminum. The blank ingot 1 has a firstsurface 10, a second surface 11 corresponding to another side of thefirst surface 10, and lateral circular surface 12 encircling the rims ofthe first and second surfaces 10 and 11. In this embodiment, the blankingot 1 is an aluminum blank ingot made up of aluminum.

Please refer to FIG. 2 to FIG. 6, which illustrate step S2 of FIG. 1. Instep S2, a mold 2 is used to press the aluminum blank ingot 1, causingthe first surface 10 of the aluminum blank ingot 1 to indent inward toform a groove 100 and a circular thick wall 120 encircling the groove100. The shape of the groove 100 can very according to the actual designrequirements. In the meantime, the lateral circular surface 12 of theblank ingot 1 is pressed to form a plurality of clipping grooves 121. Asshown in FIG. 6, the clipping grooves 121 locate on the outer surface ofthe circular thick wall 120. The mold 2 includes a male mold 20 and afemale mold 21 for working in coordination with the male mold 20. Themale mold 20 is extruded with a groove shaping part 200, which willcause the first surface 10 of the blank ingot 1 to form the groove 100.The female mold 21 is indented with a mold cave space 210 and isextruded with a plurality of circularly arranged teeth 211, whichextrude inward, on the inner wall of the mold cave space 210. The teeth211 will cause the lateral circular surface 12 of the blank ingot 1 toform the clipping grooves 121. In addition, as shown in FIG. 4 and FIG.6, on the inner wall of the mold cave space 210, the female mold 21 ofthe mold 2 further has a clipping arm shaping part 212 on each of thetwo sides of each of the teeth 211. The clipping arm shaping parts 212will cause the lateral circular surface 12 of the blank ingot 1 to forma plurality of separation grooves 123. As a result of step S2, acircular cooling base 1′ shown in FIG. 6 is formed.

It deserves mentioning that because the groove shaping part 200 of themale mold 20 of the mold 2 is used to press the first surface 10 of theblank ingot 1, the second surface 11 of the blank ingot 1 can remain itsplane shape, as shown in FIG. 7. The second surface 11 can serve as acontacting surface between the circular cooling base 1′ and a heatsource, which is not shown in the figures. Therefore, there is no needto use other process to embed any slab into the circular cooling base 1′to serve as the contacting surface.

The aforementioned steps and mold structures serve as embodiments of thepresent invention's pressing-shaping method for manufacturing a circularcooling base for being embedded with fins and the present invention'smold.

As shown in FIG. 8, the resulting circular cooling base 1′ can beembedded with a plurality of fins 3 on the clipping grooves 121 andaccordingly form a heat dissipator with fins. Furthermore, a circularlid 4 can be assembled to the bottom edges of the fins 3 so as tofurther stabilize the fins on the circular cooling base 1′.

The above description is given by way of example, and not limitation.Given the above disclosure, one skilled in the art could devisevariations that are within the scope and spirit of the inventiondisclosed herein, including configurations ways of the recessed portionsand materials and/or designs of the attaching structures. Further, thevarious features of the embodiments disclosed herein can be used alone,or in varying combinations with each other and are not intended to belimited to the specific combination described herein. Thus, the scope ofthe claims is not to be limited by the illustrated embodiments.

1. A pressing-shaping method for manufacturing a circular cooling basefor being embedded with fins, the method comprising: a) providing ablank ingot that has a first surface, a second surface, and a lateralcircular surface encircling the rims of the first and second surfaces;and b) using a mold to press the blank ingot to cause the first surfaceof the blank ingot to indent inward to form a groove, and to cause aplurality of clipping grooves to be formed on the lateral circularsurface of the blank ingot through extrusion; wherein after steps a) andb) the blank ingot is shaped into the circular cooling base for beingembedded with fins.
 2. The method of claim 1, wherein the blank ingotprovided in step a) is a solid cylinder.
 3. The method of claim 1,wherein the blank ingot provided in step a) is an aluminum blank ingot.4. The method of claim 1, wherein step b) further causes the secondsurface of the blank ingot to form a plane.
 5. The method of claim 1,further comprising: after step b), embedding a plurality of fins ontothe clipping grooves.
 6. The method of claim 5, further comprising:assembling a circular lid to the bottom edges of the fins.
 7. A mold forbeing used in the pressing-shaping method of claim 1, the moldcomprising: a male mold, extruded with a groove shaping part for causingthe first surface of the blank ingot to form the groove; and a femalemold for working in coordination with the male mold, the female moldbeing indented with a mold cave space, the inner wall of the mold cavespace being indented with a plurality of circularly arranged teeth, thecircularly arranged teeth being for causing the lateral circular surfaceof the blank ingot to form the clipping grooves.
 8. The mold of claim 7,wherein on the inner wall of the mold cave space of the female mold, aclipping arm shaping part is formed on each of the two sides of each ofthe teeth.
 9. The mold of claim 8, wherein the teeth and a plurality ofseparation teeth are formed alternately on the inner wall of the moldcave space of the female mold.
 10. The mold of claim 7, wherein theteeth and a plurality of separation teeth are formed alternately on theinner wall of the mold cave space of the female mold.